You might want to read a dictionary, rather than rely on google images, DR. Definition of knob in English: knob Line breaks: knob Pronunciation: /nɒb / noun 1A rounded lump or ball, especially at the end or on the surface of something. More example sentencesSynonyms 1.1A ball-shaped handle on a door or drawer. More example sentencesSynonyms 1.2A round button for adjusting or controlling a machine: she fiddled with the knobs on the radio More example sentencesSynonyms 1.3A small lump of a substance: add a knob of butter More example sentences 2chiefly North American A prominent round hill. 3 • vulgar slang A man’s penis. verb (knobs, knobbing, knobbed) [with object] British • vulgar slang Back to top (Of a man) have sexual intercourse with (someone). It's both.