Small short nails with flat heads

• Thumbtacks used to pin papers to surfaces

Loose temporary stitches used to hold fabric pieces in place

Courses or legs sailed while working to windward

• The maneuvers of turning the bow through the wind

Courses of action or methods; approaches

• A change to a different approach

Third-person singular present of tack

• Attaches with tacks, bastes, or turns a sailboat through the wind