Other forms: seen, saw, seeing, sees
To see is to take something in with your eyes. You see the bus coming, see a face you know across a platform, see that it is raining before you are properly awake.
It slides into understanding without changing shape: I see, do you see what I mean, I don't see the problem. It also means to meet — see a doctor, see friends at the weekend — and in the continuous it means dating, so they have been seeing each other since March. See to it that something happens means make sure of it. The past forms are irregular, saw and seen, never seed. The rule learners trip on is this: for the eyes, English prefers can, as in I can see the sea from here rather than I am seeing the sea, while seeing is exactly right for meeting people.
1verbseeTo notice something with your eyes.
“From the window you can see all the way to the bridge.”
2verbunderstandTo understand.
“I see why you didn't want to say anything.”
3verbmeetTo meet or visit someone.
“She is seeing the specialist on Tuesday.”
4verbspendTo spend time with someone romantically.
“They have been seeing each other for a year.”
5verbsureTo make sure that something happens.
“See that the gate is shut behind you.”
6verbplaceTo be the time or place in which something happens.
“Each spring sees the same birds return to the chimney.”
Too few real examples of this word to estimate which sense is commonest.
See is Old English sēon, and that word already did both jobs: to look and behold, but also to perceive, understand and know. So I see for I understand is no modern figure of speech, it is a thousand years old. Behind it stand Proto-Germanic *sehwaną and a Proto-Indo-European root *sekʷ-, to see or notice.
Proto-Indo-European
*sekʷ- — to see, notice
Proto-Germanic
*sehwaną — to see
Proto-West Germanic
*sehwan
Old English
sēon — to see, look, behold, perceive, observe, discern, understand, know
Middle English
seen
English, today
see
From Middle English seen, from Old English sēon (“to see, look, behold, perceive, observe, discern, understand, know”), from Proto-West Germanic sehwan, from Proto-Germanic sehwaną (“to see”), from Proto-Indo-European sekʷ- (“to see, notice”). refer to is a Latin vidē (“see (thou)”), which was also into academic English (see vide) as well as vide. 2
Etymology from Wiktionary, CC BY-SA