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"line" is also used as a crossword clue. If that's what you saw, the answer is often row (3 letters).
Definitions
A row, mark, or route
Word origin
From Middle English line, lyne, from Old English līne (“line, cable, rope, hawser, series, row, rule, direction”), from Proto-West Germanic *līnā, from Proto-Germanic *līnǭ (“line, rope, flaxen cord, thread”), from Proto-Germanic *līną (“flax, linen”), from Proto-Indo-European *līno- (“flax”).
Used in a sentence
“The arrow descended in a curved line.”
“St Johnstone's Liam Craig had to clear off the line before Steven Anderson sent a looping header into his own net for the equaliser on 36 minutes.”
“"I guess it's like race cars - if you get the right line you can come out at top speed."”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer20 curated clues
01“Drawn stroke”4 letters
02“Fishing cord”4 letters
03“Queue”4 letters
04“Queue at a counter”4 letters
05“Queue at a store”4 letters
06“Queue for tickets”4 letters
07“Queue of people”4 letters
08“Queue or drawn mark”4 letters
09“Queue or mark”4 letters
10“Queue or straight mark”4 letters
11“Queue or straight stroke”4 letters
12“Queue or stroke”4 letters
13“Queue outside a shop”4 letters
14“Row of waiting people”4 letters
15“Row or mark”4 letters
16“Sentence in a script”4 letters
17“Straight mark”4 letters
18“Straight mark on paper”4 letters
19“String of words”4 letters
20“Long narrow mark”4 letters
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