What are the meanings of the words 「えぐりこむ」and「べし」?


Here is the sentence I have seen them from a boxing Manga.

ひじを左{ひだり}わきからはなさない心{こころ}がまえで..... やや内{ない}角{かく}をねらい

**えぐりこむ** ようにして...打{う}つ **べし** ！

Especially 「べし」, I don't know the purpose to use it in the context.

**Another question:** As my understanding to the content, am I correctly
translating?

Translation: From the left armpit, keep the elbow close to the front of the
chest and aim to the inside corner (of the opponent) then move forward (to
him) to punch/hit.




えぐり is the 連用形 (continuative form) of えぐる, which means "to hollow out", "to
gouge"

えぐり + 込む is a 複合動詞 (compound verb). The second verb (後項動詞) in a compound
usually loses its original meaning. A small list of such verbs can be found in
[this](http://www.fluentu.com/japanese/blog/essential-common-japanese-verbs-
list/) fluentu article.

込む alone can be translated as "to be crowded", whereas this meaning is lost
here and it's more something like "to do something completely", "to do
something extremely". A great website for understanding those verbs is
<http://vvlexicon.ninjal.ac.jp/db/>, where you can click on "Search by V2" and
search for 込む. There you will get plenty of different examples with verb
compounds using 込む, covering all the different nuances that 込む might have.

べし is the same as べき, which means "to be supposed to do", "to should do
something" in this case.

～ようにして打つべし becomes "you are supposed to hit as if you were hollowing out
something completely"




えぐり is the 連用形 (continuative form) of えぐる, which means "to hollow out", "to
gouge"

えぐり + 込む is a 複合動詞 (compound verb). The second verb (後項動詞) in a compound
usually loses its original meaning. A small list of such verbs can be found in
[this](http://www.fluentu.com/japanese/blog/essential-common-japanese-verbs-
list/) fluentu article.

込む alone can be translated as "to be crowded", whereas this meaning is lost
here and it's more something like "to do something completely", "to do
something extremely". A great website for understanding those verbs is
<http://vvlexicon.ninjal.ac.jp/db/>, where you can click on "Search by V2" and
search for 込む. There you will get plenty of different examples with verb
compounds using 込む, covering all the different nuances that 込む might have.

べし is the same as べき, which means "to be supposed to do", "to should do
something" in this case.

～ようにして打つべし becomes "you are supposed to hit as if you were hollowing out
something completely"

