underpin

1. To form part of, strengthen, or replace the foundation of .

2. Support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials.

3. Support, justify, or form the basis for.

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1. To give support or substance to: "the public awareness that must underpin a sustained and concerted development effort for Africa and its youth” ( Barber B. Conable).

2. To support from below, as with props, girders, or masonry.

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Here are some other words you could make with the letters underpin, you can also
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Top Words by points	Points	Word Game
underpin	11	Scrabble

2 Letters	Scrabble® Points
de	3
ed	3
en	2
er	2
id	3
in	2
ne	2
nu	2
pe	4
pi	4
re	2
un	2
up	4

3 Letters	Scrabble® Points
den	4
dep	6
die	4
din	4
dip	6
due	4
dui	4
dun	4
dup	6
end	4
ern	3
inn	3
ire	3
nip	5
nun	3
ped	6
pen	5
per	5
pie	5
pin	5
piu	5
pud	6
pun	5
pur	5
red	4
rei	3
rep	5
rid	4
rin	3
rip	5
rue	3
run	3
uni	3
urd	4
urn	3
urp	5

4 Letters	Scrabble® Points
deni	5
dine	5
dire	5
drip	7
dune	5
dupe	7
dure	5
durn	5
ired	5
nerd	5
nide	5
nine	4
nude	5
nurd	5
pein	6
pend	7
peri	6
pied	7
pier	6
pine	6
pirn	6
pure	6
puri	6
rein	4
rend	5
ride	5
rind	5
ripe	6
rude	5
rued	5
ruin	4
rune	4
unde	5

5 Letters	Scrabble® Points
diner	6
drupe	8
duper	8
ennui	5
indue	6
inned	6
inner	5
inrun	5
inure	5
inurn	5
niner	5
nuder	6
nudie	6
penni	7
perdu	8
pined	8
pride	8
pried	8
prude	8
prune	7
purin	7
redip	8
renin	5
repin	7
riped	8
ripen	7
under	6
unpen	7
unpin	7
unrip	7
upend	8
urine	5
urped	8

6 Letters	Scrabble® Points
dinner	7
dunner	7
endrin	7
inured	7
pinder	9
pinned	9
pinner	8
pruned	9
punier	8
punned	9
punner	8
purine	8
ruined	7
undine	7
unripe	8

7 Letters	Scrabble® Points
inurned	8
punnier	9

8 Letters	Scrabble® Points
underpin	11