1. to make weak or weaker.
2. Phonetics. to change (a speech sound) to an articulation requiring less effort, as from geminate to nongeminate or from stop to fricative. verb (used without object)
3. to become weak or weaker.
"dollars can be weaken against yen."
"dates can be weaken against dollars."
"winds can be weaken during hours."
"winds can be weaken as moves."
"units can be weaken against sterlings."
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