A tamper evident closure for closing the mouth of a container having a neck and a mouth, said tamper evident closure extending along a longitudinal direction (X-X) and comprising: - a pourer with a lower part and an upper part, the lower part being able to be fixed to the neck of the container, the upper part having a pouring orifice and being movable, upon first opening, along said longitudinal direction (X-X) relative to the lower part from a first position, corresponding to the position prior to first opening, to a second position, - a cap having an outer surface able to be grasped for rotating the cap and opening and closing the container and an inner surface for closing the pouring orifice, - attachment means for removably attaching said cap with said upper part, said attachment means constraining in rotation the cap with the upper part upon first opening thereby preventing the cap from rotating relative to the upper part until the upper part has reached the second position, said attachment means releasing in said second position upon further rotation of the cap to allow the cap to be removed from the upper part, - cam means for converting, upon first opening, a rotation movement of the upper part relative to the lower part in a longitudinal movement of said cap and, by said attachment means, of the upper part relative to the lower part from the first position to the second position, wherein - in the first position, the cap and the lower part are adjacent and the outer surface of the cap is able to be grasped for opening the container, - upon first opening, upon rotation of the cap the upper part and the cap move along said longitudinal direction (X-X) relative to the lower part from said first position to said second position, - in the second position, there is a gap between the cap and the lower part, the upper part and the lower part are adapted to become mutually irreversibly locked so that the attachment means can be released to remove the cap from the upper part. - a pourer with a lower part and an upper part, the lower part being able to be fixed to the neck of the container, the upper part having a pouring orifice and being movable, upon first opening, along said longitudinal direction (X-X) relative to the lower part from a first position, corresponding to the position prior to first opening, to a second position, - a cap having an outer surface able to be grasped for rotating the cap and opening and closing the container and an inner surface for closing the pouring orifice, - attachment means for removably attaching said cap with said upper part, said attachment means constraining in rotation the cap with the upper part upon first opening thereby preventing the cap from rotating relative to the upper part until the upper part has reached the second position, said attachment means releasing in said second position upon further rotation of the cap to allow the cap to be removed from the upper part, - cam means for converting, upon first opening, a rotation movement of the upper part relative to the lower part in a longitudinal movement of said cap and, by said attachment means, of the upper part relative to the lower part from the first position to the second position, - in the first position, the cap and the lower part are adjacent and the outer surface of the cap is able to be grasped for opening the container, - upon first opening, upon rotation of the cap the upper part and the cap move along said longitudinal direction (X-X) relative to the lower part from said first position to said second position, - in the second position, there is a gap between the cap and the lower part, the upper part and the lower part are adapted to become mutually irreversibly locked so that the attachment means can be released to remove the cap from the upper part.