antaŭĝui

Read it slowly, because it is one of the loveliest things the language does.Antaŭ is before. Ĝui at 673 is to enjoy. Antaŭĝui is therefore to enjoy something in advance - to have the pleasure now, on credit, before the thing itself arrives. English cannot say it in one word. Look forward to is three words plus a stranded preposition and it describes the direction of your attention rather than the feeling; German has to reach for the noun Vorfreude, pre-joy, and English speakers borrow it because they have nothing of their own.

It behaves like an ordinary transitive verb, which is the second gift. Whatever you are looking forward to goes straight into the accusative, with no preposition to get wrong: mi antaŭĝuas la vojaĝon, ni antaŭĝuas vian viziton. Compare the English learner's usual struggle with look forward to seeing versus look forward to see. Here the infinitive simply follows: mi antaŭĝuas revidi vin.

The antaŭ- prefix is productive and worth collecting. Antaŭvidi is to foresee, antaŭdiri to predict, antaŭpagi to pay in advance, antaŭtimi to dread - which is antaŭĝui's exact opposite and built the same way. Once you have seen the pattern, you can make the word you need rather than looking it up, and that is the whole argument for the affix system in one small verb.