Verb

(undermin)

To dig underneath (something), to make a passage or for destructive or military purposes; to sap.

* 2009 , (Diarmaid MacCulloch), A History of Christianity , Penguin 2010, p. 312:

Martin, for instance, had on one occasion undermined a tree sacred to old gods, then stood in the path of its fall, but forced it to fall elsewhere by making the sign of the Cross.

(figuratively) To weaken or work against; to hinder, sabotage.

* {{quote-news, year=2012, date=April 19, author=Josh Halliday, work=the Guardian

, title= Free speech haven or lawless cesspool – can the internet be civilised? , passage=The growing use of social media to spread anger and dissent in the Arab world has been hailed by western governments as one of the chief justifications for a completely unfettered internet. The US is reportedly funding the secret rollout of technology in Iran in an effort to undermine internet censors in the country.}}

Verb

(es)

To make smaller.

* {{quote-magazine, date=2012-12-14

, author=Simon Jenkins, authorlink=Simon Jenkins, volume=188, issue=2, page=23 , date=2012-12-21, magazine=(The Guardian Weekly) , title= We mustn't overreact to North Korea boys' toys , passage=The threat of terrorism to the British lies in the overreaction to it of British governments. Each one in turn clicks up the ratchet of surveillance, intrusion and security. Each one diminishes liberty.}}

To become smaller.

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= Old soldiers? , passage=Whether modern, industrial man is less or more warlike than his hunter-gatherer ancestors is impossible to determine.

To lessen the authority or dignity of; to put down; to degrade; to abase; to weaken.

* Robynson (More's Utopia)

This doth nothing diminish their opinion.

* Bible, Ezekiel xxix. 15

I will diminish them, that they shall no more rule over the nations.

* Milton

O thou at whose sight all the stars / Hide their diminished heads.

To taper.

To disappear gradually.

To take away; to subtract.

* Bible, Deuteronomy iv. 2

Neither shall ye diminish aught from it.

(music) To reduce a perfect or minor interval by a semitone.