Adjectives that can be turned into verbs with -en

Adjective → verb
A sharp knife →to sharpen a knife
A sweet cake → to sweeten a cake by adding more sugar
A weak argument → to weaken links
A short man → to shorten trousers
A bright smile → to brighten your day
A wide road → to widen a road
A strong man → to strengthen muscles
A long flight → to lengthen your holidays
Tight trousers → to tighten your grip
A flat envelope → to flatten an envelope
Straight hair → to straighten your hair
Broad shoulders→ to broaden your horizons

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