
wegkommen
to disappear
To get lost; to no longer be findable.
Mir ist schon wieder ein Handschuh weggekommen.
I've lost a glove again.
to disappear / get away
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to disappear
To get lost; to no longer be findable.
Mir ist schon wieder ein Handschuh weggekommen.
I've lost a glove again.

to get away
To leave a place or have the opportunity to leave it.
Ich muss am Wochenende arbeiten und komme leider nicht weg.
I have to work on the weekend and unfortunately can't get away.

to come out
To be removable or come out, especially with dirt or stains.
Ich hoffe, der Rotweinfleck kommt beim Waschen wieder weg.
I hope the red wine stain comes out in the wash.

to come off well/badly
To come out of an unpleasant or dangerous situation with little or significant damage.
Bei der Kritik ist der neue Film erstaunlich gut weggekommen.
The new film came off surprisingly well in the reviews.
'Wegkommen' (to disappear / get away) is a separable verb. The prefix 'weg' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Pass auf, dass dein Schlüssel nicht wegkommt.
Be careful that your key doesn't disappear.
Since 'kommen' (to come) describes movement or a change of state, the perfect tense of 'wegkommen' is always formed with the auxiliary verb 'sein'.
Mein Portemonnaie ist gestern im Bus weggekommen.
My wallet disappeared on the bus yesterday.
When something gets lost, the person who loses it is in the dative. The lost thing is the subject of the sentence.
Mir ist mein Lieblingsstift weggekommen.
My favorite pen has disappeared on me.
In this meaning, the subject of the sentence is always a stain, dirt, or something unwanted that is supposed to be removed.
Der Kaffeefleck auf dem Hemd kommt einfach nicht weg.
The coffee stain on the shirt just won't come out.
The meaning 'to come out of a situation' is almost always combined with an adverb such as 'gut' (well), 'schlecht' (badly), 'billig' (cheaply/lightly), or 'glimpflich' (lightly/without serious harm).
Der Autofahrer ist bei dem Unfall mit nur leichten Verletzungen glimpflich weggekommen.
The driver came out of the accident with only minor injuries.
to disappear
Verschwinden and wegkommen can both mean that something can no longer be found. Verschwinden puts more emphasis on suddenly no longer being there. Wegkommen more strongly suggests that the object has been lost or gone missing.

Beim Umzug ist mein Schlüssel weggekommen.
My key went missing during the move.
Nach der Feier war mein Schlüssel plötzlich verschwunden.
After the party, my key had suddenly disappeared.