If your sink is full of water and won’t drain, you may be able to fix it yourself without having to call a plumber. One way to do this is to use a drain snake.
A drain snake is a long, flexible piece of metal with a spiral shape that can be inserted into a drain to clear away any blockages. To use a drain snake, simply insert it into the drain and turn it in a clockwise direction. The snake will then travel down the drain, breaking up any blockages in its path.
If you don’t have a drain snake, you can also try using a plunger. First, make sure that there is enough water in the sink to cover the plunger. Then, place the plunger over the drain and pump it up and down. This should create enough pressure to dislodge any blockages in the drain.
If neither of these methods work, you may need to call a plumber to clear the blockage.