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"rely" is also used as a crossword clue. If that's what you saw, the answer is often depend (6 letters).
Definitions
have faith or confidence in
Word origin
From Middle English relien, from Old French relier (“fasten, attach, rally, oblige”), from Latin religo (“fasten, bind fast”), from re- + ligo.
Used in a sentence
“I relied on "George" and "Fred"—the autopilot and the flight director—to fly the airplane while I worked my way through […]”
“Cookieless sessions enable you to take advantage of session state without relying on browser cookies.”
“Shepard: You can't rely on anyone. Sounds harsh, but it's true. Shepard: It comes down to doing what you think is right--and damn everyone else.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Have confidence in”4 letters
02“Depend”4 letters
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