| To put two and two together - to think, to understand, to understand what's what.
e. g. If only he had been quicker – more like a detective in a book – he would have observed that thumbnail, that tooth, put two and two together, and run out to give the alarm while the man’s beard was wet and soapy and his face buried in the towel (Baker’s Dozen. Thirteen Stories by Modern British and American Writers ).
Suspicion seized him. He remembered some of the things she had said. He put two and two together (S. Maugham).
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