Was heißt »sekundieren« auf Englisch?

Das Verb sekundieren lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

anpreisen:: advertise; praise; recommend
aushelfen:: assist; help (help out)
befürworten:: back; endorse; support
begleiten:: accompany
beipflichten:: endorse
beistehen:: assist; back; back up; bestead; help; stand by; support
beraten:: advise; recommend
einsetzen:: appoint
einstimmen:: tune
eintreten:: enter
empfehlen:: advise; advocate; approve; be impressed by; commend; entrust; excuse; make an impression; offer one's services; recommend; remember oneself; take leave; take your leave
engagieren:: employ (employ somebody to do something); engage (engage somebody for something); engage (engage somebody as somebody); hire
helfen:: help; helpan
unterstützen:: support
zustimmen:: agree

The second half of the nineteenth century was a period of rapid technological progress.
A second is a basic unit of measurement.
He is a second class artist.
Habit often becomes second nature.
I never doubted you for a second.
Our library is on the second floor.
The second chapter is six pages long.
In the starting position of the game, White has the rooks in a1 and h1, the knights in b1 and g1, the bishops in c1 and f1, the queen in d1, and the king in e1. Its eight pawns occupy the second row of the board, from a2 to h2.
On the second floor are two bedrooms, a bathroom and a large terrace.
There wasn't a second to lose.
City have beaten Town, a result which relegates United to the second division.
I have two children who were born on the same date, but the first is four years older than the second.
Otherwise it comes to a second round of voting, featuring the two candidates who received the most votes in the first round.
He hesitated for a fraction of a second too long.
Tom gives everyone a second chance.
Everyone gets a second chance with Tom.
Tom entered the lift and pressed the button for the second floor.
Our flat is on the second floor.
Tom left Boston at noon on June second and he got back to Boston at noon on September fourth. How many days was Tom away from Boston?
Tom pleaded with Mary for a second chance, but she brushed him off coldly.