Seconder (en. To second)
/səkɔ̃de/
Slang Meanings
To help someone informally
I will support him in his mission, even if it’s not official.
Je vais le seconder dans sa mission, même si ce n'est pas officiel.
To do the work instead of someone else
I supported him by taking on his responsibilities for a week.
Je l'ai secondé en prenant ses responsabilités durant une semaine.