I wanted to eat Chinese food but my friends wanted pizza. After discussing I "gave in to" their preference The old man was weak and finally "succumbed to" the disease and died His mother did not want her son to marry that woman and so he "submitted to" her order

"give in to" -- I don't want to argue with my wife anymore, so I give in to her. I give into temptation and eat the donut. "submit to" -- I submit this answer to you. I submit my paper to the teacher. Also, I submit myself to God. In a patriarchal structure, wives submit to their husbands and children submit to their parents. This is more profound than "give in to" -- it's more voluntary and permanent. "succumb to" -- He succombed to cancer or heart disease. [probably meaning he is dead] If I say I submitted to or succumbed to the donut, I'm being quite dramatic and denying that I had any power to resist.

Succumb is relatively rare in spoken usage, but an example would be, "in the end John succumbed to his illness." It's a fancy word that comes to English via French and Latin and is seen most often in written English. To give in is common in speech, examples : She gave in to temptation. OK, I give. (you can have your way) Mom gave in and bought us candy. Submit has a connotation of unequal power, examples: You must submit to the law. The weaker wrestler had to submit. But submit is also used to mean "offer for a decision", like this : I submitted my job application.