Meaning:
adam's peak 
n.
a mountain peak in south central Sri Lanka (7,360 feet high)
reach a (something's) peak Idiom, Proverb
actions speak louder than words
people judge by actions more than words, practice what you preach Parents should remember that actions speak louder than words. Kids imitate their parents.
not speaking
not friendly, not speaking to each other Emily and Pam had a fight. They're not speaking.
on speaking terms
not friendly but saying hello etc. Louise and I are not friends, but we're on speaking terms.
so to speak
using expressions or metaphors when speaking, to use the vernacular Ron was up the creek, so to speak. He'd promised to marry Suzy, but he was already married to Joan.
speak for
make a request for, ask for He spoke for the comfortable chair as soon as he entered the room.
speak highly of
praise, say that a person is great or excellent Angela's former teachers speak very highly of her.
speak of the devil and he appears
a person comes just when one is talking about him "Speak of the devil and he appears," I said just as our colleague who we were talking about walked in the door.
speak one
say openly what one thinks I think that it is time for me to speak my piece and tell them what I want to do about the plans for a new factory.
speak out
speak in favor of or in support of something My boss spoke out in favor of a promotion for me.
speak up
speak louder, crank it up Please speak up so everyone can hear you.
An reach a (something's) peak idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with reach a (something's) peak, allowing users to choose the best word for their specific context.
Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb reach a (something's) peak