nid wrth ei big y mae prynu cyffylog

• nid wrth ei big y mae mesur cyffylog

• (North Wales, standard) IPA^(key): /ˌnɪd ʊrθ ei̯ ˌbiːɡ ə maːɨ̯ ˌprənɨ kəˈfəlɔɡ/
  • (North Wales, colloquial) IPA^(key): /ˌnɪd ʊrθ i ˌbiːɡ ə ma ˌprənɨ kəˈfəlɔɡ/
• (South Wales, standard) IPA^(key): /ˌnɪd ʊrθ ei̯ ˌbiːɡ ə mai̯ ˌprəni kəˈfəlɔɡ/
  • (South Wales, colloquial) IPA^(key): /ˌnɪd ʊrθ i ˌbiːɡ ə ma ˌprəni kəˈfəlɔɡ/

nid wrth ei big y mae prynu cyffylog

1. "Never judge a book by its cover", literally "One doesn't buy a woodcook according to its beak", deriving from the practice of selling woodcocks in a closed bag with only the long beak poking out being visible.