Sentence:  In the first round of a suit, you should generally, / 8. PLAY YOUR HIGHEST CARD THIRD HAND. / a. In order to strengthen your partner. You presume that he leads from his strong suit, and wants to get the winning cards of it out of his waynb...; you, therefore, do not <WSD>finesse</WSD>nb..., but play your highest, remembering that you play the lowest of a sequencenb.... With ace, queen (and, of course, ace, queen, knave, &c., in sequence) you do <WSD>finesse</WSD>, for, in this case, if the king is in the fourth hand, it must make, unless single, which is very improbable; and by putting on the ace, you make the king good, if against you. 
Meaning of the word marked with <WSD> tags:  To attempt to win a trick by finessing. (from mid 18th c.)