He watched, or observed, a thing; (M, K; *) as also ↓رَبَأَ and ↓اربأ and ↓ارتبأ: (TA:) he guarded (حَارَسَ, T, M, K) men, (M,) or a man, (T, K, *) being guarded by him. (T.)
2.
He was cautious of, or he feared, a thing, (T, * S, K, *) or a man; (M;) verbal noun مُرَابَأَةٌ. (T, S. [In one of my copies of the S, رَبَأْتُ الشَّىْءَ مَرْبَأَةً is erroneously put for رَابَأْتُ الشىء مُرَابَأَةً.])