chaperone (suomeksi)

esiliina (s: seurustelevaa paria valvova tai nuoren naisen suojelijana miesseurassa oleva vanhempi henkilö / an older person who accompanies younger people to ensure good behaviour)
kaitsija (s: an older person who accompanies younger people to ensure good behaviour)
olla esiliinana (jollekin) (v: protein that aids in folding other proteins)