tide / tied are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
tide: (noun) the periodic rise and fall of the sea level under the gravitational pull of the moon. (noun) something that may increase or decrease (like the tides of the sea). (noun) there are usually two high and two low tides each day. (verb) rise or move forward. (verb) cause to float with the tide. (verb) be carried with the tide.
tied: (verb) fasten or secure with a rope, string, or cord. (verb) finish a game with an equal number of points, goals, etc.. (verb) limit or restrict to. (verb) form a knot or bow in. (verb) make by tying pieces together. (verb) unite musical notes by a tie. (adjective) bound together by or as if by a strong rope; especially as by a bond of affection. (adjective) fastened with strings or cords. (adjective) of the score in a contest.
tide: t·AY·d
tied: t·AY·d
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)