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hos·tler(hŏs′lər, ŏs′-) also os·tler (ŏs′-)
1. One who is employed to tend horses, especially at an inn.
2. One who services a large vehicle or engine, such as a locomotive.
[Middle English, from Anglo-Norman hostiler, from Old French hostel, lodging; see hostel.]
hos•tler(ˈhɒs lər, ˈɒs lər)
1. a person who takes care of horses, esp. at an inn.
2. a person who services trains, buses, etc., or maintains large machines.
[1350–1400; Middle English; variant of hosteler]