cõng chữ lên non

== Vietnamese == === Etymology === Literally “to go up a mountain, carrying letters on one's back”. === Pronunciation === (Hà Nội) IPA(key): [kawŋ͡m˦ˀ˥ t͡ɕɨ˦ˀ˥ len˧˧ nɔn˧˧] (Huế) IPA(key): [kawŋ͡m˧˨ t͡ɕɨ˧˨ len˧˧ nɔŋ˧˧] ~ [kɔŋ˧˨ t͡ɕɨ˧˨ len˧˧ nɔŋ˧˧] (Saigon) IPA(key): [kawŋ͡m˨˩˦ cɨ˨˩˦ ləːn˧˧ nɔŋ˧˧] === Verb === cõng chữ lên non (idiomatic) to go to a remote, mountainous and underdeveloped area to do voluntary teaching