From WordNet (r) 3.0 (2006):
tack
n 1: the heading or position of a vessel relative to the trim of
its sails
2: a short nail with a sharp point and a large head
3: gear for a horse [syn: stable gear, saddlery, tack]
4: (nautical) a line (rope or chain) that regulates the angle at
which a sail is set in relation to the wind [syn: sheet,
tack, mainsheet, weather sheet, shroud]
5: (nautical) the act of changing tack [syn: tack, tacking]
6: sailing a zigzag course
v 1: fasten with tacks; "tack the notice on the board"
2: turn into the wind; "The sailors decided to tack the boat";
"The boat tacked" [syn: tack, wear round]
3: create by putting components or members together; "She pieced
a quilt"; "He tacked together some verses"; "They set up a
committee" [syn: assemble, piece, put together, set
up, tack, tack together] [ant: break apart, break
up, disassemble, dismantle, take apart]
4: sew together loosely, with large stitches; "baste a hem"
[syn: baste, tack]
5: fix to; attach; "append a charm to the necklace" [syn:
append, tag on, tack on, tack, hang on]
6: reverse (a direction, attitude, or course of action) [syn:
interchange, tack, switch, alternate, flip, flip-
flop]