interjection
give it a try!; try it out!
A polite, somewhat formal invitation to try something, often used in customer-facing contexts like product samples or service offers. The あれ is an imperative form of ある, giving a slightly old-fashioned or elegant feel.
新発売のスイーツです。ぜひお試しあれ。
These are our newly released sweets. Please give them a try.
無料サンプルをご用意しております。お試しあれ。
We have free samples available. Please try them out.
Formed from the honorific prefix お + the noun form of 試す (ためす, 'to try') + the imperative form of ある (あれ, 'be'). The construction is a set phrase meaning 'please have a try'.