also: ありゃあ · ありゃー
Casual interjection expressing surprise, realization, or mild shock. Often used when noticing something unexpected.
Oh no, I forgot my wallet.
if there is; if (I/you) have
Colloquial contraction of あれば. Used in casual conditional expressions, often with a nuance of 'if there happens to be' or 'if available'.
Whoa, it's already this late?
If I have time, I'll drop by.
It's not like you can do anything just because you have money.
あれ and ありゃ can both express puzzled surprise, but あれ is the more standard, widely used form while ありゃ is a rougher regional-sounding variant.
Emphatic or drawn-out variant, often used in casual speech or writing.
Long-vowel variant conveying stronger emotion or casual tone.
The interjection is a natural exclamation derived from the sound of surprise. The conjunction is a contraction of あれば, a common colloquial reduction in spoken Japanese.