Sentence:  The declarer may not have fear of losing control on trumps, because even after <WSD>ruffing</WSD> in one hand, the other hand will have sufficient length to draw the trumps. A 4-4 fit of trumps is considered to be the best and most convenient for the declarer. ... He can easily make 5 or 6 or even 7 tricks in trumps by way of <WSD>ruffing</WSD> once, twice or thrice in one hand. 
Meaning of the word marked with <WSD> tags:  To play a trump card to a trick when unable to follow suit (that is, to play a card of the same suit as the previous or leading card). (late 16th c.)