5. (Physical Geography) (intr) (of seas or lakes) to rise in waves 6. (intr) to well up or overflow 7. (Music, other) (tr) to make (a musical phrase) increase gradually in volume and then diminish n 8. (Physical Geography) a. the undulating movement of the surface of the ope...
Definition of swell noun from the Oxford Advanced Learner's Dictionary swell noun /swel/ /swel/ [countable, usually singular] the movement of the sea when it rises and falls without the waves breaking The boat was caught in a heavy (= strong) swell. Extra ExamplesTopics Geographyc2 ...