vasxu -vax-va'u- gismu

x1 breathes/respires x2 [gas].

(though used to make the Lojban word, clue word vascular is erroneous, actually pertaining to the circulatory system that carries the respired oxygen to the tissues); See also fepri, kijno, vacri.

In notes:

fepri
x1 is a/the lung [body-part] of x2; [metaphor: breathing/respiratory apparatus/bellows].
kijno
x1 is a quantity of/contains/is made of oxygen (O); [metaphor: supporting life/combustion].
vacri
x1 is a quantity of air/normally-gaseous atmosphere of planet x2, of composition including x3.
bifca'e
c1=b2 (agent) blows c2.
cniva'u
v1 sighs due to emotion c2 (ka) about c3 breathing/respiring v2.
damva'u
v1 smokes/inhales v2. v1 is a smoker.
damvaxtu'u
t1 is a pipe for inhaling burned substance d1 used by v1 made of material t2.
dirva'u
v1 chokes on/because of d3.
marnyva'u
v1 smokes cannabis of type m2.
moltenva'u
x1=v1 yawns/[breathes while stretching mouth]
patyva'u
v1=p1 sighs in exasperation responding to p2 (event/state).
sakyva'u
v1=s1 inhales v2=s2.
sigva'u
v1 is a cigarette/cigar smoker; v1 smokes cigarettes/cigars.
tairva'u
v1=t1 pants because of tiring effort/situation t2 (event).
terzbi
n3 is a nostril of n2 (main body) in nose n1.
va'urpante
p1=v1 protests with a sigh about p2 (event/state) to audience p3 with action p4.
vaxfanta
x1=f1 strangles x2=v1; x1=f1 prevents x2=v1 from breathing gas x3=v2.
vaxselnandu
n2=v1 has difficulty breathing gas v2 under conditions n3; n1=v1 pants.
vaxtisna
x1 breathes in; x1 breathes x2 in
vaxtoltisna
x1 breathes out; x1 breathes x2 out
vaxydicra
d1 chokes v1 by/with d3.
vaxydjuca'a
x1=c1=s1 is a ventilator for helping x2=s2 to breath
zbisnava'u
v1 breathes gas v2 producing nasal sound; v1 snorts.