'to think (about something)'. it's basically from saenggakhada

Think about it

O I see. Thanks Nick .

생각해 (saeng gak hae) it means "i think, you think, he thinks,she thinks" it's from the verb 생 각 하 다 means to think.... saeng gak hae is a declarativet form of saeng gakhada. and it is not polite. for polite. add yo'.