cnita -nit-ni'a- gismu

x1 is directly/vertically beneath/below/under/underneath/down from x2 in frame of reference x3.

Also underside, nether. See also dizlo, gapru, galtu, farna, loldi.

In notes:

dizlo
x1 is low/down/downward in frame of reference x2 as compared with baseline/standard height x3.
farna
x1 is the direction of x2 (object/event) from origin/in frame of reference x3.
galtu
x1 is high/up/upward in frame of reference x2 as compared with baseline/standard height x3.
gapru
x1 is directly/vertically above/upwards-from x2 in gravity/frame of reference x3.
loldi
x1 is a floor/bottom/ground of x2.
ga'i
attitudinal modifier/honorific: hauteur - equal rank - meekness; used with one of lower rank.
drukorni'a
x1=k1=n1 (individual or mass) is the eave of roof x2=k2=n2=d1
lolni'ajbama
j1=c1 is a landmine with explosive material/principle j2.
ni'ablo
x1 is a submarine for carrying x2, propelled by x3.
nitkla
k1 descends/goes down to k2=c1 from k3=c2 via k4 using means k5.
nitmau
z1=c1 is lower than z2 beneath c2 in frame of reference c3 by amount/excess z4.
nitrai
t1=c1 is the lowest among set/range t4 beneath c2 in frame of reference c3.
nitsalpo
s1 dips at an angle of s2 to reference frame s3, to beneath c2.
nitytse
z1 sits on surface z2=c1 that is below c2 in frame of reference c3.
xanyni'a
x1 is the palm (body-part) of x2
xejni'a
c1 is a/the chin [body part] of x2.
ku'arka
x1 is a quark with flavor x2
ka'urkuarka
k1 is a quark with flavor k2.