Breakoffs are pieces or parts that become separated from a larger whole. The antonym of breakoffs would be "attachment" or "extension." An attachment refers to something that is added or connected to something else, while an extension refers to the act of continuing or elongating something. Both of these antonyms are opposite to breakoffs, as they suggest a joining or continuation rather than a separation or termination. For example, a tree branch can be an attachment to the trunk, while a vine can be considered an extension that grows along a wall. The use of antonyms can help to understand a word's meaning by considering its opposite.