A strong verb, especially in Germanic languages, is one which experiences a vowel change in the stem when forming the past tenses.

Examples:

English:
sit -> sat
break -> broken

Swedish:
skriva -> skrev (To write)
dricka -> drack (To drink)

Latin's closest approximation to strong verbs are third-conjugation verbs, whose perfect stems may be radically different from their present stems.

Oppose weak verb.
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