"Let's eat."

Translation: 식사합시다.

[pattmahiney]

먹다 to eat (general)
식사하다 to dine/have a meal

식사합니다 - (i,you,whatever) has a meal
식사합시다 - let's have a meal

[nsynthesia]

in stead of 식사합시다, we can also say 먹자 right? or is it used differently?

[wintertriangles]

먹자 is very informal. That's the only difference.

[TeamHPDR_Hen1103]

So 식사합니다 is formal and more polite?

[Ep35882]

The verb itself (식사하다 vs 먹다) is more formal and so is the ending (ㅂ시다 vs 자).

[FireJade]

Is there a difference between 식사하다 and 먹다?

[JacksonCur53912]

식사하다 is to have a meal and 먹다 is to eat. Slightly different meanings.

[aloyoyen]

먹다 is very informal

[Adrian-Michael]

What is the difference between meokda and siksihada?