Third-person singular simple present indicative form of er

(sports, automotive) Acronym of energy recovery system: an electric generation, storage, and propulsion system used in Formula One, which generates electricity by scavenging excess power and energy, stores energy in batteries, and boosts acceleration with electric motors assisting the gasoline engine.

(informal, originally school slang) Used to form slang or colloquial equivalents of words. / (informal, originally school slang) Used to form mostly adjectives used informally.

plural of be-er

plural of ER

Said when hesitating in speech.

(informal) To utter the word "er" when hesitating in speech, found in the phrase um and er.

(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun.

(added to a proper noun) Suffix denoting a resident or inhabitant of (the place denoted by the proper noun); used to form a demonym.

(obsolete, no longer productive) Suffix used to form the plural of a small number of English nouns.