Undersay

Part of speech: verb

Definitions

1. To express something with less force, completeness, or emphasis than the facts warrant
2. To convey an idea or message in a way that fails to capture its full strength or significance
3. To articulate something in a restrained manner that leaves its true weight or importance unstated

Etymology: "Undersay" is a plain compound: the prefix "under-" joined to the verb "say." The prefix in this sense means "less than what is required" or "not fully," so to undersay something is to state it at less than its real size or force. It is the sort of coinage English makes freely, and the word needs no special history to be understood. The clearest way to see the word's logic is to compare it with its siblings. "Understate" and "underplay" follow the same pattern, and "undersay" fits neatly beside them, describing a speaker who gives a weaker account than the facts support. The word's meaning comes entirely from the two parts working together, so there is little more to trace beyond them.