Synonyms for tack

noun

1. A short, broad-headed nail

   thumbtack, glazier point, push pin, carpet tack, copper tack; see also nail, pin 1.

2. An oblique course

   tangent, deviation, digression, variation, alteration, sweep, swerve, zigzag, yaw, echelon, sidling, siding, switch, turn-about-face*; see also turn 6.

verb

1. To fasten lightly

   pin, paste, baste, tie, nail, mount, sew, stitch, hem piece together; see also fasten 1.

2. To steer an oblique course

   go in zigzags, zigzag, change course, turn in the wind, deviate, turn about-face, alter one's course, jibe, yaw, sheer, wear, shift, switch, shunt, bear*; see also turn 6, veer.

   Antonyms straighten*, hold a course, take a straight course.