verb-intransitive. To give forth a low, moaning sound in breathing; to utter a groan, as in pain, in sorrow, or in derision; to moan.verb-intransitive. To strive after earnestly, as with groans.v. To affect by groans.n. A low, moaning sound; usually, a deep, mournful sound uttered in pain or great distress; sometimes, an expression of strong disapprobation.