رَاهُنْتُ فُلَانًا عَلَى كَذَا

, (S, Msb,) verbal noun مُرَاهَنَةٌ, (S,) or رِهَانٌ, (Msb,) or both, (K, and so in a copy of the S,) I laid a bet, or wager, or stake, with such a one, for such a thing, (S, Msb, K, *) mostly (TA) said in relation to horses running a race, (JK, TA, *) to be taken by him who should outstrip, or overcome. (Msb.)

The inf. ns. also signify (tropical:) The contending [of two persons] to outstrip [in a race] upon horses, (K, TA,) and otherwise. (TA.) Hence the prov., هُمَا كَفَرَسَىْ رِهَانٍ [explained in article فرس]. (JK.)