tithe
TYTH (rhymes with "lithe") · noun
Origin
Tithe comes from Old English tēoþa, meaning "tenth," tracing back to a proposed Proto-Germanic root for "a tenth," *tehunþô. Along the way, an Ingvaeonic sound change dropped the nasal consonant that once sat inside the word.
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Journey
The verb sense (to tithe, meaning to give a tenth) developed in Middle English from the Old English verb tēoþian, built on the same numerical root as the noun.
Related words
Tithe is a doublet of tenth — the two words descend from the same Old English root but took different paths into modern English.