The term 'bowstring groove' refers to the grooves in a bow that hold the bowstring in place. The crossword solutions for this term are 'NOCK' (4 letters), 'STRANGLE' (8 letters), 'nocks' (5 letters), 'TAUT' (4 letters), 'WAX' (3 letters), and 'stria' (5 letters). 'NOCK' is the notch at the end of the bow where the bowstring is attached, while 'nocks' is the plural form of the word. 'STRANGLE' is the act of tightening the bowstring, while 'TAUT' means tightly stretched. 'WAX' is often used to lubricate the bowstring and make it easier to pull, and 'stria' is the grooves in the bow that hold the bowstring in place.