tighten up

VERB
10 LETTERS · STARTS WITH T

tighten up is a valid 10-letter word worth 15 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1I1G2H4T1E1N1U1P3
1 + 1 + 2 + 4 + 1 + 1 + 1 + 0 + 1 + 3 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does tighten up mean?

VERB · 1 SENSE
1

Severely restrict in scope or extent.