spare-time activity

Từ điển Oxford Learners Wordfinder Dictionary

noun

an auxiliary activity
• Syn:
avocation, by-line, hobby, pursuit, sideline
• Derivationally related forms:
hobbyist (for: hobby), avocational (for: avocation)
• Hypernyms:
pastime, interest, pursuit
• Hyponyms:
speleology, spelaeology