Irish: listen! — the imperative; hearing chosen in the moment it happens.
Irish éist, the bare imperative of the verb "to listen" (éistim / éisteann), from Old Irish éistid; because Irish verbs cite the imperative as their dictionary headword, the command is the base form of the word, not a special or marked case.
The command form of hearing, chosen and taken rather than left to happen on its own. A word that names an act reached for, not a sense merely sitting there available.