old salt

NOUN /oʊld_sɔlt/
8 LETTERS · STARTS WITH O

old salt is a valid 8-letter word worth 8 points in Scrabble and 10 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
O1L1D2S1A1L1T1
1 + 1 + 2 + 0 + 1 + 1 + 1 + 1 =8 PTS
DOUBLE WORD → 16TRIPLE WORD → 24
MEANING

What does old salt mean?