jogger

the word 'jogger' is a modern english formation, combining the verb 'jog' with the agent suffix '-er'. the verb 'jog' emerged in the 16th century, likely as an alteration of the earlier middle english 'shoggen', meaning to shake or jolt, which itself may have onomatopoeic origins. by the mid-20th century, 'jog' had acquired its specific athletic sense of running at a slow, steady pace for fitness. the suffix '-er', a prolific agent-noun marker in english, attaches to this verb to logically denote 'one who jogs'. the term for the clothing item, 'joggers', is a later metonymic extension, named after the activity for which such trousers are commonly worn.

Structure: jog (to run slowly) + er (person/thing that does) jog (verb, of uncertain origin, likely a variant of 'shog' meaning to shake or jolt, from Middle English). er (agent noun suffix, from Old English -ere, from Proto-Germanic -ārijaz, indicating a person associated with an action).