New Oxford American Dictionary:
build
verb
1 they were building a tree house: construct, erect, put up,
assemble; make, form, create, fashion, model, shape.
2 they are building a business strategy: establish, found, set up, institute, inaugurate, initiate.
3 the pressure was building: increase, mount, intensify, escalate, grow, rise.
Oxford English Dictionary:
1. a. trans. Orig. To construct for a dwelling; to erect (a house), make (a nest).
Hence, To erect, construct (any work of masonry), and by extension,
To construct by fitting together of separate parts; chiefly with reference to structures of considerable size, as a ship or boat, a carriage, an organ, a steam-engine (not, e.g. a watch or a piano). Const.
of, more rarely
from,
out of,
with (the material),
on (the foundation).
In early mod.Eng. used with up without change of meaning; but
to build up (in literal sense) now implies a contrast with pulling down, or with a previous state of decay, as ‘to build up again’.
to build a fire: to arrange or pile the fuel.
to build a railroad, said in U.S., is unknown in England.
Therefore, he is building a bike
A.