He injured his one-arm joint while playing basketball.

The arm's length principle is a name given to the concept that transactions between related parties should be conducted as if they were unrelated parties.

She held the book tightly under her arm.

He took her arm and led her to the dance floor.

He spent all his money playing the one-arm bandit.

She folded her arms and looked away.

I twisted his arm to go to the party.

I had to twist his arm to get him to come to the party.

She was twisting his arm to go to the party.

The seven-arm octopus is a deep-sea creature found in the Atlantic Ocean.