“Have a Squiz” Means “Take a Quick Look”

In Australian and New Zealand English, a squiz is a quick, sometimes inquisitive look. If someone says, “Have a squiz at this”, they simply mean “take a look at this”; they are not asking you to squint.

A: I’ve changed the first paragraph.
B: No worries. I’ll have a squiz now.

The expression is relaxed and informal, so it suits friends and familiar colleagues. Chinese speakers sometimes use “Let me see it”. That is grammatical, but it can sound as though you want the object handed over. When discussing a document, photo or new item, “Let me have a look” is a more neutral choice. In a formal email, “I’ll take a look” is clear; there is no need to force Australian slang into the sentence.

https://www.merriam-webster.com/dictionary/squiz
https://www.collinsdictionary.com/dictionary/english/squiz