He is fair and square in his dealings. Here, the idiom 'fair and square' refers to -

• He is fair and square in his dealings.
- Here, the idiom 'fair and square' refers to - ঘ) honestly and straightforwardly.

• Fair and square
English Meaning: with absolute accuracy; honestly and straightforwardly.
Bangla Meaning: পরিপূর্ণভাবে ন্যায্য / সততা এবং সরলতা / সৎ ও সরল।

Ex. Sentence: He is fair and square in his dealings.
Bangla Meaning: সে সততা ও নিষ্ঠার সাথে ব্যবসা করে৷

Source: Website Lecture.