FromProto-Vietic*ʔəh(“to stay”); cognate withMuongớ.
Most prepositions in Vietnamese were originally verbs:cho(“to give; for”),đến(“to come; to”),tới(“to arrive; to”),lên(“to go up; onto”),vào(“to enter; in, into”),theo(“to follow; according to”),về(“to return; about”).
Similarity toChinese於 /于 is coincidental, as semantically the Vietnamese word is a grammaticalized verbal and phonetically there is a tonal mismatch.
ở
- at,in
ở• (於,𣄒,𫵦)
- tobe, tolive, tostay, toremain
ở (upper caseỞ)
- The letterơ inhỏi tone.