To take the plunge

To take the plunge - to commit oneself to a course of action about which one is nervous.

Example - "She wondered whether to enter for the race, but decided to take the plunge"

http://www.dontgiveupyourdream.com/wp-content/uploads/sites/2485/2013/08/TakeThePlunge.jpg

Spiffy

Spiffy - Smart in appearance.

Example - "She's just got a spiffy new outfit."

http://media.spiffy.sg/spiffy-media/2012/06/spiffy1-610x341.png

Germane

Germane - relevant to a subject under consideration.

Example - "That is not germane to our team."

http://www.drimmit.com/public/dreams/original-milestone-21-dec-2012-time-2012-12-21-15-11-14-userid-2684.jpg

Untenable

Untenable - not able to be maintained or defended against attack or objection.

Example - "This article is clearly untenable."

Example - http://www.apisanet.com/nnh-content/uploads/pe/people-leave-when-life-becomes-untenable-where.jpg

Understudy

Understudy - a person who learns another's role in a play or musical in order to be able to act at short notice in their absence.

Image - http://alfalfastudio.com/wp-content/uploads/2012/08/amphibian_productions_understudy_featured.jpg

Inured

Inured - accustomed to something, especially something unpleasant.

Example - "These children have been inured to violence."

Image - http://wordinfo.info/words/images/inured-1.jpg

Wildcat

Wildcat - sudden and unofficial.

Example - "We need a new legislation to curb wildcat strikes".

Image - https://marygrovecampusnews.files.wordpress.com/2012/02/wildcat-strike.jpg

To annihilate

To annihilate  /əˈnʌɪɪleɪt/ - to destroy utterly.

Example - "A simple bomb of this type could annihilate them all."

Image - http://www.wordbypicture.com/thumbs/annihilated-thumb.jpg

You can't have your cake and eat it too

You can't have your cake and eat it too - The proverb literally means "you cannot both possess your cake and eat it". Once the cake is eaten, it is gone. It can be used to say that one cannot or should not have or want more than one deserves or can handle, or that one cannot or should not try to have two incompatible things. 

Image - https://s-media-cache-ak0.pinimg.com/736x/46/e1/be/46e1be64a66c6cba0ddbae15aa2382f8.jpg

Chuffed

Chuffed - very pleased.

Example - "I am dead chuffed to have won."

Image - http://memecrunch.com/image/521a3168afa96f4c6500000e.jpg?w=400

To heckle

To heckle  - to interrupt (a public speaker) with aggressive comments or abuse.

Example - "He was booed and heckled when he tried to address the demonstrators."

Image - https://nicklewin.files.wordpress.com/2013/02/heckle-cartoon.jpg